To be exact, the patrol has a Thompson submachine gun with a drum barrel, and a Madsen M-50 as well as Winchester Model 21. Plus, the rifle-grenadier.
Here is a series of columns from the NY Times on the Vietnam war called "Vietnam '67." Broad spectrum of articles, useful source material.
Phong Nga is dead.
If you intend to enter a different fight, with a different year/time, I am there. I won't continue with the PAVN.